MSIE does not support type=”application/ecmascript” and type=”application/javascript” in the Script tag, which meet RFC 4329.
Example: <script language=”javascript” type=”application/javascript” … />
Solution: If you don’t care about XHTML compliance or expressiveness of your markup, it’s safe to use a plain script tag. If you do care, you should use “text/ecmascript” or “text/javascript”.